openai
GPT 5.1 Codex Max
Use an endpoint supported by this model.
Get a key for this setup →const response = await fetch('https://api.minirouter.sh/v1/chat/completions', { method: 'POST', headers: { Authorization: `Bearer ${process.env.MINIROUTER_KEY}`, 'Content-Type': 'application/json', }, body: JSON.stringify({ model: 'openai/gpt-5.1-codex-max', messages: [{ role: 'user', content: 'Why is the sky blue?' }], max_tokens: 1024, }),}) const data = await response.json()console.log(data.choices[0].message.content)- Input / 1M
- $1.3125
- Output / 1M
- $10.5
- Context
- 400K
- Max output
- 128K
Overview
Overview
GPT‑5.1-Codex-Max is purpose-built for agentic coding.
- Model type
- language
- Context window
- 400,000
- Maximum output
- 128,000
- Input / 1M tokens
- $1.3125
- Output / 1M tokens
- $10.5
- Released
- 2025-11-19
Prices include the MiniRouter fee. Compatibility snapshot: 2026-08-06. Input: text, image, pdf. Output: text.
Endpoints
Endpoints
Platform-funded routing only. Caller BYOK credentials and OIDC-based upstream authentication are intentionally excluded; authenticate with a MiniRouter bearer key.
Paths
/v1/chat/completions/v1/messages/v1/responsesStructured output
JSON Schema and JSON mode enforced on verified providers. How it works
Captured parameters: max_tokens, temperature, stop, tools, tool_choice, reasoning, include_reasoning, response_format, structured_outputs.
API
API
Switch between Chat Completions, Messages and client configurations in the setup panel. Every snippet keeps the model ID unchanged.
Base URL
https://api.minirouter.sh/v1Model ID
openai/gpt-5.1-codex-maxProviders
Providers
MiniRouter selects from the configured routes below. Priority is the catalog order, not a latency or availability score.
| Provider | Priority | Input / 1M | Output / 1M | Parameters | Access |
|---|---|---|---|---|---|
vercel | 1 | $1.3125 | $10.5 | max_tokens, temperature, stop, tools, tool_choice, reasoning, include_reasoning, response_format, structured_outputs | MiniRouter balance |